I suggest you should always welcome constructive criticism. It is essential for creativity, innovation, and problem solving. Since leadership requires all three, leaders need to be sure not only that they are open to criticism, but that they actively seek it out.
You should not simply ask for general feedback but ask people-direct reports, peers, customers-to poke holes in your ideas and approaches.
It will help us to remember-critique can be useful approach to test idea and keep people and team accountable.